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IndyCar announced a rules tweak on Friday that calls for lapped cars to fall to the back of the field in the final 15 laps of a race. Photo by LAT PHOTOGRAPHIC

IndyCar has made a series of modifications to its rulebook that were announced Friday at Mid-Ohio.

Regarding late-race restarts, any within the final 15 laps will see lapped cars moved to the rear of the field. Before, it was the final 10 laps.

If circumstances do not permit a penalty to be served during the race, the race director shall declare the race results provisional while the penalty is reviewed.

As for the tire rule that caught Izod IndyCar Series followers off-guard in Toronto, the two-lap tire usage minimum is waved if the tire is damaged in a crash. IndyCar allowed Dario Franchitti's crew to change a tire after a first-lap contact in Toronto.